SOGIR 17
| Type | Oceanographic cruise |
|---|---|
| Set | This cruise is part of the set SOGIR |
| Ship | Côtes De La Manche |
| Ship owner | CNRS until 2019 - IFREMER since 2020 |
| Dates | 29/01/2017 - 29/11/2017 |
| Chief scientist(s) | DERRIENNIC Hervé |
ENVIRONNEMENTS ET PALÉOENVIRONNEMENTS OCÉANIQUES ET CONTINENTAUX - UMR 5805 Allée Geoffroy Saint-Hilaire CS 50023 33615 Pessac Cedex +33 (0)5 40 00 88 67 |
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| DOI | 10.17600/17009900 |
| Objective | The cruise has two complementary strands: regional ecological monitoring action at the Le Blayais nuclear power plant site (coord. by Ifremer), nationwide action by the coastal zone observation service (SOMLlT via RNSM, INSU). Ecological monitoring of the Le Blayais site consists in three sampling stations sampled eight times over the year (one station adjacent to the plant, one downstream and one upstream). These stations are shared with SOMLIT. The latter federates the marine stations at Wimereux, Roscoff, Brest, Arcachon-Talence, Banyuls, Villefranche-sur-Mer and Marseilles, aiming to better understand coastal ecosystems subject to anthropogenic and climate influences. Annual and interannual variability -whose study is one of the main objectives of the observation service- can only be assessed if samples are taken throughout the year (impact of winter floods on the hydro-sedimentology and on the biological cycle of zooplankton species). SOMLIT is also based on a coherent network of measurement points (in number and location) to sample neritic and estuarine waters. At each SOMLIT-Blayais mission, 10 times a year, samples are taken at 3 or 4 stations at a set point during a neap tide cycle. Samples are taken approximately three hours apart (1 at high-tide, 2 at half-tide, at low tide) at two levels (1m below surface and 1m above seabed). In-situ measurements and samples: depth, TO, salinity, dissolved oxygen, pH, speed and direction of current; water samples and zooplankton samples. Grab samples taken of macrobenthos. Measurements in the laboratory: Winkler, suspended matter, nutrients, POC, chlorophyll a, zooplankton and macrobenthos counts, bacteriology. |
